[Fizz] Render preamble eagerly #33730
Merged
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We unnecessarily render the preamble in a task. This updates the implementation to perform this render inline.
Testing this is tricky because one of the only ways you could assert this was even happening is based on how things error if you abort while rendering the root.
While adding a test for this I discovered that not all abortable tasks report errors when aborted during a normal render. I've asserted the current behavior and will address the other issue at another time and updated the assertion later as necessary